Semigroups with [ x] [ y] = [y][x].
E. D. DeVun (1980)
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E. D. DeVun (1980)
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I.L. Hmelnitsky (1985)
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M. Gutan (1996)
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I.L. Mel'nichuk (1989)
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V.P. Schneider (1982)
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F. Catino, F. Migliorini (1992)
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M. Satyanarayana, T. O'Brien, M. Rajagopalari (1986)
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A. Nagy (1984)
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T. Budak (1993)
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E.G. Tretjakova (1993)
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R.R. Zapatrin (1993)
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